file_permissions

Permissions in Linux are managed at the file level Every file is owned by a user and a group

Permission String

$\text{r - read permission}$ $\text{w - write permission}$ $\text{x - execute permission}$

Description	Type
Regular File	-
Directory	d
Link	l
Device	b / c
Socket	s
Pipe	p

Changing File Permissions

can be changed using chmod

chmod [WHO][OP][WHAT] NAME

WHO can be one of:

• u - User who owns the file
• g - Users in the group which owns the file
• o - Other users
• a - All users OP must be:
• + - Add a permission
• - - Remove a permission WHAT is one of the Three permission types each permission segment can have a comma(,) to indicate another permission chmod u+rw,go-rwx private.txt